Filter.



No. 696,24I. Patented Mar. 25, |902. A. JOHNSON.

FILTER.

(Application mea June 24.,y 1901.) (No Model.) 3 Sheets-Sheei 2i Se' LN wf. mams PETERS cn. PNoYo-Lxwo., wAsmHG'roN. u. c.

Patontad Mar? 25, |902.

A. .loun'som no.' 696,24l.

FILTER.

(Applicntion Bled June S4, 1901.)

(No Modal.) v

3 Shouts-Sheet` 3.

UNITED l STATES PATIENT OFFCF..

ALFRED JOHNSON, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR OF THREE- FIFTHS TO ALEXANDER SIVANSON AND JOHN NELSON, OF MINNEAP- OLIS, MINNESOTA.

FILTER.

SPECIFICATION forming part of Letters Patent No. 696,241, dated March 25, 1902.

' Application inea June 24, 1901. serial No. 65,748. da model.)

To all whom-it may concern.-

Be it known thatI, ALFRED JOHNSON, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Filters; and I do hereby declare the following to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates especially to large iiltering plants, such as required for use in connection with city Waterworks, and has for its objects to improve the same in the several particulars hereinafter noted.

The invention consists of the novel devices and combinations of devices hereinafter described, and defined in the claims.

The inventionl is illustrated in the accompanying drawings, wherein like characters indicate like parts'throughout the'several` views.

Figure 1 is a view principally in plan, but with some parts sectioned and others broken away, showing several of my improved lters applied in working position within a large water-reservoir, such asused in connection with the city Waterworks. y Fig. 2 is a trans- Verse vertical section approximately on the line m2 m2 of Fig. 1, but with some parts broken away and others sectioned in vertical linel with the axes of the lters. Fig. 3 is a ver,-

tical section approximately'on the line co3 mi" of Fig. 1, some parts being broken away. Fig. 4 is a vertical section approximately on the line m4 x4 of Fig. 1, some parts being broken away and the wall portions ofV the reservoir being removed; and Fig. 5 is an enlarged verdrical chamber 7 between the two intermediate cylinders 6, as best shown in Fig. 5. The annular chamber 7 is divided into segmental compartments running from end to end of the drum by means of imperforate spacingstrips 8, placed between the intermediate cylindrical screen 6. Other spacing or dividing strips 9 are placed between the two outer screens and the two inner screens in radial lines with the spacing-strips S. The strips S and 9 divide the entire separating-surface of the drum into segmentalcompartments or sections, as best shown in Fig. 5.

Each rotary ltering-drum is mounted as follows: The closed trunnion 5 thereof is looselyl mounted in a suitable bearing aorded by a bearing-plate 10, which in turn is lverticall y adjustable on the in wardly-proj ecting lianges of a vertically-extended rectangular guide-frame 11. The inner and open trunnion 5 of said filtering-drum is loosely journaled in the sleeve-bearing of a bearingplate 12, which is grooved to closely't and to move vertically on the vertical inturned flanges of a rectangular guide-frame 13,whicl1 guide-frame is built into the walls of the draw-od sluice 2, but extends high above the same. I The sleeve-like bearing of each bearing-plate 12 is provided with anon-rotary disl charge-elbow 14..

The filtering-drums are adapted to be raised vertically in suitable slots cut in the guideframe 13, upward from the bearing-hubs of the bearing-plates y12, and to keep these slots closed when said drums are raised the said bearing-plates 12 are provided with depending plate portions 15, which serve as valves or gates. Said gate portions 15 iit closely against the inturned anges and against the lower web portions 16of the said guide-frame 13.

The filtering-drums may be raised and lowered by various devices, but are preferably IOO KJ l

given such movement by the following-described means: The lower ends of vertical screw-rods 17 are secured to the upper ends of the bearing-plates lO and 12. The upper ends of these screw rods 17 work loosely through suitable seats formed in the upper transverse portions of the frame 11 and 13, and workin g with screw-threaded engagement thereon above said brackets are worm-gears 1S, which act as nuts. A shaft 19, mounted in suitable bearings in the upper ends of the brackets 1l and 13, extends horizontally in line with the several worm-gears 1S and is provided with worm-sections 20,which engage one with each of the said worm-gears. At one end the shaft 19 is shown as provided with an operating-crank 2l. As is evident, by manipulating the hand-crank 2l both of the filtering-drums will, through the connections described, be simultaneously raised or lowered. Of course the shaft 19 might be sectioned, so that the filtering-drums could be raised and lowered independently.

The closed trunnions 5 of the drum-heads 4 are shown as provided at their outer ends with rigidly-secured gears 22. A pinion 23, suitably mounted on the adjacent bearingplate 10 and provided with an operatingcrank 2i, meshes with each gear 22, as best shownin Figs. 2 and 3. As is evident, by turning the crank 24 the filtering-drum may be rotated.

A so-called collecting-head 25, which is ot' inVerted-trough-like form and has closed ends, rests with its longitudinal flanges 2G on the outer surface of the outer cylindrical screen 6 of each rotary filtering-drum. These collecting-heads 25 extend substantially from end to end of the filtering-drums, and their longitudinal flanges 26 are so spaced that but one segmental section of said drums may be completely exposed to the said head at one time. (See particularly Fig. 5.) A draft-pipe 27 extends from the top of the collecting-head 25 to a fan 28. The fan 2S delivers through a pipe 29 to any suitable point.

To each bearing-plate 10 is rigidly secured a disk 30, through which opens the lower end of an air-supply pipe 3l. The outer heads 4 of the filtering-drums are provided each with a series of elongated perforations 32, which open into-the annular air-space 7. One of the perfor-ations 32 opens into each segmental section of said annular air-space 7. When one of the segmental sections of the drum is turned into registration with the cavity of the collecting-head 25, the perforation 32 of that section will register with the inner end of the air-supply pipe 3l, as best shown in Fig. 5. All of the other of said perforations 32 will be closed by the disk 30.

The operation of the device will be substantially as follows: Suitable provision is made whereby the level of the water in the reservoir l with respect to the filtering drum or drums will remain substantially as indicated by the lines e' in Figs. 2, 3, and 5, so

that there will always be one section of the drum which is out of use or through which the water is not permitted to percolate. This adjustment may be maintained in various ways-as, 'for instance, by an overfiow in the said reservoir or by adjusting the drum as an entirety, so as to maintain the said relations. This, as is evident, always leaves one section of the drum inoperative, so that it.may be cleaned while the other sections are all operative. A very'large per cent. of the sediment taken from the water by the filter will be deposited on the outer surface of the outer screen 6. When the fan 28 is running, a strong draft of air will be drawn in through the air-supply pipe 3l into the inoperative section of the annular air-space 7, and from thence it will be drawn outward through the two outer screens 6 and the interposed filtering material and into the collecting-head 25. From the collecting-head 25 the air will of course be drawn out through the pipe 27 and discharged from the pipe 29. This passage of air will rapidly dry the deposited sediment or impurities left by the water, and will then carry them from the screen and discharge the same with the blast.

By successively moving the sections of tho filtering-drum to its inoperative or cleaning position the entire collecting-surface of the filter maybe kept clean without interrupting the action of the filter. When it is necessary or desirable to repair the filters or to gain more complete access thereto, they may, as already indicated, be raised into inoperative positions above the water.

The water which passes from the reservoir 1 into the interior of the drums will run out through the open trunnions 5 thereof and elbows ltinto the draw-off sluice 2. The Water in the draw-off sluice should be kept lower than the water in the reservoir l.

The device above described is, as has been stated, especially adapted for use in very large filtering plants. Many of the features IOO IIO

thereof may, however, be used to good advantage in small plants, such as required for private or family use. Itis also evident that the device above described is capable of many modifications within the scope of my invention.

The expression draft device as herein used to designate the means for cleaning the filter is-used in a broad sense. Instead of a draft of air a stream of water might be circulated through the exposed or inoperative section of the filter, and this would be within the scope of my invention.

What I claim, and desire to secure by Letters Patent of the United States, is as follows:

1. The combination with a filter, of a draft device for cleaning the same, having a receiving-head engageable in succession with different sections of the filter, substantially as described.

2. The combination with a rotary filteringdrum, of a draft device for cleaning the same,

IZO

having a receiving-head which is engageable in succession withdifferent sections of said filtering-drum, substantially as described.

3. The combinationwith a rotary iilteringdrum,having longitudinally-extended peripheral compartments, of a relatively fixed collecting-pocket engaging the outer ilteringsurface of's'aid drum, and means for producing a draft through said collecting-pocket and the engaged filtering-surface of said drum, to clean the said filtering-surface, substantially as described.

4. The combination with a reservoir, of a rotary filter mounted therein with a portion thereof always above the water-level thereof, and a draft device arranged to operate upon the exposed and inoperative surface of said filter, substantially-as described.

5. The combination with a reservoir, of a rotary iiltering-drum having longitudinallyextended compartments, which drum is mounted in said reservoir with `one section thereof always movable into apositionto eX- pose its outer filtering-surface above the water-level, and a draft device voperative on Witnesses:

ELIZABETH KELIHER, F. D. MERCHANT. 

